Either Jiri truly believed he was done and attested to that or he was being tactful, not wanting to add fuel to the fire of any type of controversy that would take away from Alex’s win. Either way, he deserves a lot of props. We’ve seen tons of interviews where some guy denies even being hurt when he was clearly wobbled or badly rocked. Jiri is a class act.
As for the actual outcome- yeah it looked like Jiri still could have been given a bit more time before the stoppage but there’s also no doubt that Alex had him in a terrible spot. I’m not going to argue that it was a bad stoppage because I think the optics clearly looked like Jiri went limp and dropped back. Ref makes his decision without the benefit of replay.